Cisco: Kernel panic caused by RCU stall while accessing flash file system
Summary: An MDS Supervisor-4 module resets without warning.
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Symptoms
An MDS Supervisor-4 module resets while accessing a flash file system.
The show system reset-reason shows the reason as a kernel panic:
Reason: Kernel Panic
The show system internal kenel nvram-messages previous command has the following messages: 1.A warning for "d_shrink_del" 2. "rcu_sched self-detected stall" type of signature line and "t=" value is 2100 or greater (the CPU number and PID are not relevant)
[850772.912879 <3>] WARNING: CPU: 3 PID: 11665 at ... d_shrink_del+0x30/0x73()
...
[850793.913314 <3>] INFO: rcu_sched self-detected stall on CPU { 3} (t=2101 jiffies g=12138660 c=12138659 q=39875)
...
[850793.917818 <3>] Kernel panic - not syncing: RCU self stall taking too long
Cause
Cisco bug CSCwj03301
This issue may apply only to Cisco MDS NX-OS releases earlier than release 9.4(1).
This issue may apply only to Cisco MDS Supervisor-4 platforms.
Resolution
Fix:
Upgrade to NX-OS code 9.4.1 or higher
Affected Products
Connectrix MDS-Series, Connectrix MDS-9706, Connectrix MDS-9706-V2, Connectrix MDS-9710, Connectrix MDS-9710-V2, Connectrix MDS-9718, Connectrix MDS-9718-V3, Connectrix MDS-Series Firmware 8.X, Connectrix MDS-Series Firmware 9.XArticle Properties
Article Number: 000222207
Article Type: Solution
Last Modified: 20 Feb 2024
Version: 1
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